How PHP converts full-width symbols in text to half-width

How does PHP convert the full-width symbol in text to half-width? This article will share a good package of conversion methods, you can refer to. We hope to help you.

Converts a string containing full-width numeric characters, letters, spaces, or '%+-() ' characters to corresponding half-width characters

/** * Converts a string containing full-width numeric characters, letters, spaces, or '%+-() ' characters to corresponding half-width characters * @access public * @param string $str to be converted String * @return string $str processed String */ function Make_semiangle ($str) {$arr = array (' 0 ' = ' 0 ', ' 1 ' = ' 1 ', ' 2 ' = ' 2 ', ' 3 ' = ' 3 ', ' 4 ' = ' 4 ') , ' 5 ' = ' 5 ', ' 6 ' = ' 6 ', ' 7 ' = ' 7 ', ' 8 ' = ' 8 ', ' 9 ' = ' 9 ', ' a ' = ' a ', ' b ' = ' ' B ', ' c ' = ' C ', ' d ' + ' d ', ' e ' = ' e ', ' f ' = = ' f ', ' g ' = ' = ' g ', ' h ' = ' h ', ' i ' = = ' I ', ' j ' = ' j ', ' k ' = ' k ', ' l ' = ' L ', ' m ' = ' = ' m ', ' n ' = ' n ', ' o ' = ' = ' o ', ' p ' = ' P ', ' q ' = = ' Q ', ' r ' = = ' R ', ' s ' = ' s ', ' t ' =&G T ' T ', u ' ~ = ' u ', ' V ' = ' V ', ' w ' = ' W ', ' x ' = ' x ', ' y ' = ' y ', ' z ' = ' = ', ' a ' = = ' A ', ' b ' = = ' B ', ' C ' = ' C ', ' d ' = ' d ', ' e ' = ' ' e ', ' f ' = = ' f ', ' g ' = = ' g ', ' h ' = ' h ', ' i ' = ' I ', ' j ' = ' j ', ' K ' = ' k ', ' l ' = ' + ' ' l ', ' m ' = = ' m ', ' n ' = ' n ', ' o ' = ' o ', ' p ' = ' P ', ' q ' = ' Q ', ' r ' = ' R ', ' s ' =&G T ' s ', ' t ' = ' t ', ' u ' = ' u ', ' V ' = ' V ', ' w ' = ' W ', ' x ' = ' x ', ' y ' = ' y ', ' z ' = ' = ', ' (' = ' = ' (') ' ' = ') ', ' (' = ' + ' [', ') ' + '] ', ' ' ' ' + ' [', ' ' ' ' + '] ', ' ' ' = ' ' [', ' ' ' ' + '] ', ' ' ' ' + ' [', ' ' ' ' + '] ', ' =  > ' [', ' ' + '] ', ' {' = ' = ', '} ' = ', ' ' ' = ' < ', ' ' = ' > ', '% ' = '% ', ' + ' + ' + ', '-' = '-', '-'-' + '-', ' ~ ' + '-', ': ' + ': ', '. ' = = ', ', ', ' = = ', ', ', ' = ', ', ', ' = ', ', '; ' = ', ', '? ' = = '? ', '! ' = = '! ' = '-'-', ' ‖ ' and ' | ', ' ' ' ' ' ' ' ' ' ' ', ' ' ' + ' ', ' ' = ', ' ' ' ' ' ' '     > "); Return Strtr ($str, $arr); }

<?php     $str = "0123abcdfws\",.? <> {}[]*&^%#@! ~ () +-|:; ";     echo "$str";     echo "<br/>";     $str = Preg_replace ('/\xa3 ([\xa1-\xfe])/E ', ' Chr (Ord (\1) -0x80) ', $str);     echo $str;?>

Also share a function for everyone
In many forms of collecting user information, expect the user to input half-width characters, but no matter how you emphasize, how to remind, or there will be careless users to submit full-width data, in fact, in some novice eyes, full-angle and half-angle is no difference, even they will feel: I submitted clearly is the correct information, Why do you prompt for errors?

In fact, full-width and half-width have one by one correspondence, and most users do not intentionally enter the wrong information, so we can use the program to avoid this situation, the most, can be converted to give the user a chance to confirm, so that may be able to give users a better experience.

Here is a function that implements the reciprocal of the character half-width and the full-width

<?phpheader ("content-type:text/html;  Charset=utf-8 ");//First parameter: Pass in the string to be converted//second parameter: Take 0, half angle to full angle, take 1, full angle to half-width function sbc_dbc ($str, $args 2) {$DBC = Array (' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' g ', ' H '  , ' I ', ' j ', ' K ', ' l ', ' m ', ' n ', ' o ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' u ', ' V ', ' w ', ' x ', ' Y ' , ' Z ', ' a ', ' B ', ' C ', ' d ', ' e ', ' f ', ' g ', ' h ', ' I ', ' j ', ' K ', ' l ', ' m ', ' n ', ' O ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' u ', ' V ', ' w ', ' x ', ' y ', ' z ', '-', ', ': ', '. ' , '，' , '／' , '％' , '＃' , '！ ', ' @ ', ' & ', ' (', ') ', ' ' ', ' ', ' ', ', ', '?    ', ' [', '] ', ' {', '} ', ' \ ', ' | ', ' + ', ' = ', ' _ ', ' ^ ', ' ￥ ', ' ￣ ', ');        $SBC = Array (//half-width ' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' D ', ' E ',    ' F ', ' G ', ' H ', ' I ', ' J ',    ' K ', ' L ', ' M ', ' N ', ' O ', ' P ', ' Q ', ' R ', ' S ', ' T ', ' U ', ' V ', ' W ', ' X ', ' Y ', ' Z ', ' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' g ', ' h ', ' I ', ' j ', ' K ', ' l ', ' m ', ' n ', ' o ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' u ', ' V ', ' W ', ' x ', ' y ', ' z ', '-', ', ', ': ', '. ', ', ', '/', '% ', ' # ', '! ', ' @ ', ' & ', ' (', ') ', ' < '    , ' > ', ' ' ', ' ' ' ', ' ', ' ' ', ' ', ' ' ', ' ' ', ' ' ', ' ' ' ', ' ' ' ', ' ' ' ' ' ' ' ' ' ' ', ' ' ' ' ' ' ' ' ' ' ' '  if ($args 2 = = 0) {return str_replace ($SBC, $DBC, $STR);  Half-width to full-width} else if ($args 2 = = 1) {return str_replace ($DBC, $SBC, $STR);    Full-width to half-width} else {return false; }} $str 1 = "http://", $STR 2 = "/http", echo "half-width to full-angle", "<br/>"; Echo $str 1. ' and '. SBC_DBC ($str 1, 0), echo "<br/><br/> Full-width turn half-angle: <br/>"; Echo $str 2. ' and '. Sbc_dbc ($str 2, 1);? >

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